Driver's side window works fine; the other 3 don't work at all. The driver's door interior Unlock All switch doesn't work either, but I can still use the key fob and driver's side external button to lock/unlock all the doors.

The problems with the windows and locks started at the exact same time. One day they didn't work, next day they did, then they stopped working permanently.

Any ideas on what it might be? I've looked all over, but I haven't found anything that might be relevant.

 

Check the fuse

if it's not the fuse then replace your Master Power Window Switch

 

It's the master window switch. This is a common issue on the V36 models. That baby is about 400 bucks though.